<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
                <MyHeader @addTodo="addTodo"></MyHeader>
                <MyList :todos="todos"></MyList>
                <MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"></MyFooter>
            </div>
        </div>
    </div>
</template>

<script>
// 引入组件
import MyHeader from "@/components/MyHeader.vue";
import MyList from "@/components/MyList.vue";
import MyFooter from "@/components/MyFooter.vue";


export default {
    name: "App",
    components: {
        MyHeader, MyList, MyFooter,
    },
    data() {
        return {
            todos: JSON.parse(localStorage.getItem('todos')) || []
        }
    },
    watch: {
        // 深度监视 使用这样的方法，若果是监视对象的第一层可以采用的函数的形式
        todos: {
            deep: true,
            handler(value) {
                localStorage.setItem('todos', JSON.stringify(value))
            }
        }
    },
    methods: {
        addTodo(todoObj) {
            this.todos.unshift(todoObj)
        },
        checkTodo(id) {
            this.todos.forEach((todo) => {
                if (todo.id === id) {
                    todo.done = !todo.done
                }
            })
        },
        deleteTodo(id) {
            this.todos = this.todos.filter((todo) => {
                return todo.id !== id
            })
        },
        // 全选或者全不选择
        checkAllTodo(done) {
            this.todos.forEach((todo) => {
                todo.done = done
            })
        },
        clearAllTodo() {
            this.todos = this.todos.filter((todo) => {
                return !todo.done
            })
        }
    },
    mounted() {
        this.$bus.$on('checkTodo',this.checkTodo)
        this.$bus.$on('clearAllTodo',this.clearAllTodo)
    },
    beforeDestroy() {
        this.$bus.$off('checkTodo')
        this.$bus.$off('clearAllTodo')
    }
}
</script>

<style>
/*base*/
body {
    background: #fff;
}

.btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

.btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
}

.btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
}

.btn:focus {
    outline: none;
}

.todo-container {
    width: 600px;
    margin: 0 auto;
}

.todo-container
.todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
</style>